My point is that if it is built out in HTML - it should work on any device that can render HTML.

Many other art-based, photography focused and creative writing projects work fine in my browser. You seem to just be avoiding the removal of bad UX patterns (fixed elements) for personal reasons - which is fine.

But you shouldn’t hint towards the fact that it’s “how things are” and they “can’t be fixed”. You’re hurting user experience for personal preference - not limitations.